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Thread: Vector Sort C++

  1. #1
    Senior Member crazyfool's Avatar
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    Vector Sort C++

    hey guys,
    I need a little help. I have a vector of objects, each object has a name and an age variable. I want to be able to sort the vector by each objects age. Google brings up alot of results but I don't really understand most of them. This is what I've got so far. (might be some syntax mistakes, not a copy and paste job)

    Class people{ string name, int age..... }

    vector<people> vec;

    bool SortMethod (const people& person1, const people& person2) const
    { return person1.getage() < person2.getage(); }

    void Sort()
    {
    (vec.begin(), vec.end(), SortMethod);
    }


    Now according to all the threads I've read this is how to do it but it doesn't seem to do anything. Little help please. Thanks.

  2. #2
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    Re: Vector Sort C++

    How big is the vector going to be? My mind's not in a place where it can deal with C++ right now, but by the looks of it that's going to be Bubble Sort - which be slow! Still, not a problem if it's not many entries.
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    Senior Member crazyfool's Avatar
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    Re: Vector Sort C++

    About 10 objects in the vector

  4. #4
    Ah, Mrs. Peel! mike_w's Avatar
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    Re: Vector Sort C++

    Firstly, define a comparator for sorting (as you have done with SortMethod). As well as defining a function, you can also define an object to do the same job:

    Code:
    struct AgeComparator {
        bool operator() (const People & first, const People & second) {
            return first.getage() < second.getage();
        }
    } ageComparator;
    Then, where you want to sort the vector:

    Code:
        sort(vec.begin(), vec.end(), ageComparator);
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    Re: Vector Sort C++

    Not using a list instead?

    http://www.cplusplus.com/reference/stl/list/sort/

    Not sure why you are using a vector tbh
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    Re: Vector Sort C++

    Actually a vector would be better for things like quick sort, because of the random access ability.

    a List is not designed to allow simple random access.
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    Re: Vector Sort C++

    Tbh I only used vectors because that is what I was most familiar with, they do the job for what I need them for anyways
    Haven't been able to try out mike_w's code yet but I'll give it a go later on today
    Thanks for all the replies anyways guys

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